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SN75ALS085DW Datasheet(PDF) 2 Page - Texas Instruments |
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SN75ALS085DW Datasheet(HTML) 2 Page - Texas Instruments |
2 / 19 page SN75ALS085 LAN ACCESS UNIT INTERFACE DUAL DRIVER/RECEIVER SLLS054D – APRIL 1989 – REVISED OCTOBER 2001 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The purpose of the loop functions is to provide a means by which system data-path verification can be done to isolate faulty interfaces and assist in network diagnosis. The LOOP pins are TTL compatible and must be held high for normal operation. When LOOP1 is taken low, the output of driver 1 (TXO1) immediately goes into the idle state. Also, the input to receiver 1 is ignored, and a path from a transmit input (TXI1) to RXO1 is established. When LOOP1 is taken back high, driver 1 and receiver 1 revert back to their normal operation. When LOOP2 is taken low, a similar data path is established between TXI1 and RXO2. TXEN1 must be high for the loop functions to operate, and TXEN1 can be used to gate the loop function if desired. During loop operation, the respective RXEN reflects the status of TXEN1. The SN75ALS085 is characterized for operation from 0 °C to 70°C. AVAILABLE OPTIONS PACKAGED DEVICES TA PLASTIC SMALL OUTLINE (DW) PLASTIC DIP (NT) 0 °C to 70°C SN75ALS085DW SN75ALS085NT The DW package is available taped and reeled. Add the suffix R to device type (e.g., SN75ALS085DWR). Function Tables RECEIVER (LOOP = H) RXI PREVIOUS OUTPUTS RXI RXEN RXEN RXO VID = 1315 mV to –175 mV, tw < 25 ns L L H VID = –275 mV to –1315 mV tw > 50 ns X H L VID = 318 mV to 1315 mV, tw < 142 ns H H H VID = 318 mV to 1315 mV, tw > 187 ns X L H H = high level, L = low level, X = don’t care DRIVER (LOOP = H) TXI TXEN PREVIOUS TXO OUTPUT TXO L L Idle Idle H L Idle Idle ↓ H Idle L L H Active L H < 260 µs H Active H H > 8 µs H Active Idle L L > 8 µs Active Idle H < 260 ns L > 8 µs Active Idle H < 260 ns L < 260 ns Active H H > 8 µs L < 260 ns Active Idle L L < 260 ns Active L H = VI ≥ VT max, L = VI ≤ VT min |
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